why would a piece of uranium be hotter than a piece of rock in the same environment? rock, meaning a rock with no uranium or radioactive minerals. why do you suppose? - releasing energy. - more unstable. because... check your neighbor in this one. this is something--you guys know enough physics to do this. what does it mean to say something's hot? hot, temperature-wise. well, they're emitting alpha and beta particles and those are going at high speed and hitting the other atoms-- yeah. --and it's making it move faster. yeah. just to say something's hot, you're gonna think it's moving faster, eh? little particles moving-- but guess what? they're moving faster when they're kicked around. what's kicking them around? how about some alpha particles there in you, honey, you'll be hot, too. they're gonna just kick around a little bit. that's all, it's that simple. so it turns out things would be-- why do you suppose we're getting all these volcanoes over there in the big island? where's that heat coming from? you know, that's the earth, honey, the earth's natural heat. where